Add a testcase for changing ringbuffer size. This tests not only ringbuffer size but also tests the imbalance per-cpu buffer size change too.
Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Acked-by: Steven Rostedt (VMware) rostedt@goodmis.org --- Changes in v3: - Run test on an instance too. --- .../ftrace/test.d/00basic/ringbuffer_size.tc | 22 ++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
diff --git a/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc new file mode 100644 index 000000000000..ab70f0077c35 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc @@ -0,0 +1,22 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Change the ringbuffer size +# flags: instance + +rb_size_test() { +ORIG=`cat buffer_size_kb` + +expr $ORIG / 2 > buffer_size_kb + +expr $ORIG * 2 > buffer_size_kb + +echo $ORIG > buffer_size_kb +} + +rb_size_test + +: "If per-cpu buffer is supported, imbalance it" +if [ -d per_cpu/cpu0 ]; then + cd per_cpu/cpu0 + rb_size_test +fi